Dental plugger



Patented Feb. 17, 1880.

rave/aibn' H. D. JVUS'II, I Dental-Flaggen M2122 .9 .9e an? NPEFJ?S,PHOTO-LITHOGRAFHER, WASHINGTON. D C.

. UNITED STATES PATENT OEErcE,

D. JUSTI, OFVPHILADELPHIA, PENNSYLVANIA.

. DENTAL PLUGGER.

SPCEICIEIC.ATION` forming part of` Letters Patent No. 224,595, datedFebruary 1'?, 1880.'

Applicationnieaseptembenas,1819.

To all whom it may concern: d y d d y Beit known that 1, HENRY DMTUSTI,of

` Philadelphia, in thewcounty ot'Bhiladelphia andState of Pennsylvania,have invented certain y Improvements.. in Dental Pluggers, `of which thefollowingis a specification. i

lMy invention relates toimprovenlents upon the instrument for whichLetters Patent were tween the rotarycam` or hammer and the stem" grantedto me bearing date Mayl, 1879, and numbered 215,226; and theimprovements consist in the interposition of a spring beor tool-shankfor the purpose oi' rendering the action noiseless,and`in an adjustablecollar andl spring to control the force of the blow.` y

Figure l represents a side elevation of my .improyed instrument; Fig.2,a longitudinal centraLsection of thesame; Fig. 3, a crossupon the upperend of a sliding shank or spindle, B, wbichlatter is mounted in atubular body, G, jointed i to the hammer-sustaining framed). l

In the original instrument the hammer dey livered its blow directly uponthe shank or spindle, thereby-producing an unpleasant hammering noise.

To overcome this trouble I now locate between the hammer and the upperend of the` spindle a flat spring, E, one end of which is secured to thebody G, as shown.,

. carry down the spindle in a practically noiseless manner.

In this manner I am enabled to give the instrument a much smoother,easier, and more quiet action, without in the least impairing itsefficiency. The form and at-` tachment of theispring may, if desired, be

modified, provided its mode of action is not changed.

In my original instrument a spring urged the spindle or stem constantlyupward within threaded to receive an exterior cap or collar,

F, the lowerend of which lis chambered out or counterbored to receivethe enlarged lower end ofthe spindle or shank B, as shown. The spindleis of reduced diameter from its upper end to the point` where it entersthe collar F, at which point it is enlarged, as shown, so as to form ashoulder, c. This shoulder, striking the bottom` of` the recess in thecollar, thereby limits the ascent of the spindle, and thus determinesthe distance which the spindle will be moved by the hammer, andconsequently the force ot' the blow imparted to it. By screwing thecollar upward the force of the blow may be increased, and by screwing itdownward the force may be diminished.

In order to prevent the collar from being moved by the jar andconcussion of the instrument, the collar is notched on the outside andthe tubular body provided with a spring arm or catch, d, to engagetherein, as shown.

In order to urge the spindle downward out of the path of the hammer whenthe instrument is not in use, a spiral spring s seated into an annularrecess in' the spindle and arranged to bear against the interior of thecollar, as shown. This spring presses the spinl dle downward wheneverthe tool is not in use; but a slight downward pressure of the instrumentupon the tooth forces the spindle upward in position to receive theblows of the hammer. The spindle is retained in place lin the body bymeans of a screw, c, inserted through the side of the body into anannular groove in the spindle,.as shown, the groove being made ot' theproper width to permit the endwise movement of the spindle, and of suchdepth'as to allow a free rotation of the same. y

It will be observed that in the present instrument the spring acts tourge the spindle away from the hammer, instead of toward the same, as inmy original instrument.. This ar- IOO rangement admits of the hammerrunning continuously without noise and without acting upon the spindleuntil a downward pressure is brought to bear upon the instrument, andalso admits of the force of the blow being modified by sim ply chan gingthe pressure, and without chan ging the devices by which a limit is Xedas to the force of the blow.

I do not claim, broadly, the combination of a hammer, a spindle, and aspring tending to urge the spindle away from the hammer, for I am awareof a plu gger wherein the pressure of the spindle toward thereciprocating hammer served to aetuate intermediate mechanism throughwhich the hammer-actuating devices were set in motion. In thearrangement above alluded to it is necessary that the hammer shallremain at rest when the instrument is not in use, for the reason thatotherwise the hammer would keep up a constant annoying and destructivepounding within the instrument, and this necessity, in turn,-renders theuse of the intermediate devices between the spindle and hammerunavoidable.

My arrangement differs from that above described in that l use a rotaryinstead of a reciprocating hammer, and so arrange and organize the partsthat the rotary hammer is permitted to run continuously and noiselesslywithout acting upon the spindle until the latter is pressed backward,whereupon it is brought Within range of and acted upon by the hammerwithout having recourse to intermediate parts or devices. The advantagesgained are greater simplicity, reduced cost, absence of noise, andgreater rapidity -of action.

Having described my invention, what I claim is 1. The combination of therotary hammer, sliding spindle, and an intermediate spring to receivethe blow, substantially as described and shown.

2. The combination, in a dental plugger, of the rotary hammer, thesliding spindle, and the iiat metal spring to receive the blow,substantially as described.

3. The combination of the body, the rotary hammer, the sliding spindleprovided with a shoulder or projection, the spring arranged to urge thespindle away from the hammer, and the adjustable collar to limit themovement toward the hammer.

4. A dental plugger consisting of a body or hand-piece, a slidingspindle, a rotary eccentric-hammer mounted in the body to act againstthe spindle, and a spring urging the spindle away from the hammer, saidparts being organized and arranged as described and shown, so that therotary hammer may run continuously and noiselessly and without strikingany of the parts until the spindle is forced back in use.

5. The combination of the body, the collar adapted to regulate themovement of the spindle, and the spring-catch or locking device.

6. The combination, in a plugger, of the body, the shoulderedendwise-inoving spindle provided with the annular recess, the springseated in said recess, and the adjustable collar.

HENRY D. J USTL Witnesses:

A. A. ToPPIN, C. BRossMANN.

